If you are below Va, you do not have the aerodynamic capability to (+ G) over-
stress the airplane. This means, no control input and/or wind gust or what have you will be able to over stress the airplane because the wing will accelerate stall before it generates enough lift to damage it.

That said, a 60 -70 bank is fine however, if you intend to maintain altitude, you may be in a position where if you pulled back enough to maintain alt, you could accelerate stall thus NOT maintaining altitude. It's not the bank that stalls the airplane, it's the require back pressure to maintain level that stalls the airplane

ie. 70 degrees + no back pressure still = 1 G (descending ofcourse) but no accelerate stall